干涉仪量子增强相位精密测量的光子损耗鲁棒性  

Photon loss robustness of optical interferometer for quantum-enhanced phase precision measurements

作　　者：李俊宏 冯夏宁 韦联福 LI Junhong;FENG Xianing;WEI Lianfu(Information Quantum Technology Laboratory,School of Information Science and Technology,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学信息科学与技术学院信息量子技术实验室,成都610031

出　　处：《激光技术》2025年第2期159-165,共7页Laser Technology

基　　金：国家重点研发计划资助项目(2021YFA0718803);国家自然科学基金资助项目(11974290)。

摘　　要：为了提高光子光学干涉仪在光子损耗情形下的相位测量精度,以典型的twin-Fock态为例输入光子马赫-曾德尔干涉仪,对光子符合计数探测在光子损耗下的探测精度进行了理论研究。结果表明,相较于宇称测量,当使用光子对作为输入时,光子符合计数探测方案对光子损耗显示出更强的鲁棒性,基于光子符合计数探测的相位测量精度在相位位于π/4和π/2之间时可以非常接近于量子克拉美罗界。采用光子符合计数探测方案有助于在实际环境中实现超高精度的相位测量,从而为突破传统散粒噪声限制提供了可能性。In order to improve the phase measurement sensitivity of photonic optical interferometers in photon loss scenarios,a theoretical study of the sensitivity of photon coincidence measurement under photon loss has been carried out using a typical twin-Fock state as an input of a photonic Mach-Zehnder interferometer.Compared to parity measurement,the analysis shows that the photon coincidence measurement scheme is more robust to photon loss when using photon pairs as input,and the phase measurement sensitivity based on photon coincidence measurement can be very close to the quantum Cramér-Rao bound when the phase is betweenπ/4 andπ/2.The results show that the use of the photon coincidence measurement scheme can help to achieve ultra-high precision phase measurements in real-world environments,thus offering the possibility of breaking through the traditional scattering noise limit.

关 键 词：量子光学 量子精密测量 马赫-曾德尔干涉仪 量子克拉美罗界 光子符合计数探测 

分 类 号：O431.2[机械工程—光学工程] P111.47[理学—光学]